To add dependencies and devDependencies to a package.json file from the command line, you can install them in the root directory of your package using the -save-prod flag for dependencies (the default behavior of npm install) or the -save-dev flag for devDependencies. Adding dependencies to a package.json file from the command line You can add dependencies to a package.json file from the command line or by manually editing the package.json file. 'devDependencies': Packages that are only needed for local development and testing.Īdding dependencies to a package.json file.'dependencies': Packages required by your application in production.To see which versions of a package will be installed, use the semver calculator. When you (or another user) run npm install, npm will download dependencies and devDependencies that are listed in package.json that meet the semantic version requirements listed for each. List them as 'dependencies' or 'devDependencies' in your package's package.json file. To specify the packages your project depends on, you must

Npm update dependencies